http://www.catvet.homestead.com/EarlyAlter.html
http://www.winnfelinehealth.org/reports/early-neuter.html
http://www.devonrex.com/kittens/earlyalter.htm
http://www.cvm.uiuc.edu/ope/ivb/spay-neu.htm
http://www.cfainc.org/articles/spay-neuter.html
http://www.messybeast.com/earlyneuter.htm
http://www.netcat.org/symposium/early-neuter-spay.html

Tonkinese Genetics